package com.eclipse.training.extensions.wizards;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWizard;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.jdom2.Document;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;

import com.eclipse.training.extensions.LogManager;
import com.eclipse.training.models.ModelContainer;
import com.eclipse.training.models.ModelProvider;

/**
 * This is a sample new wizard. Its role is to create a new file resource in the
 * provided container. If the container resource (a folder or a project) is
 * selected in the workspace when the wizard is opened, it will accept it as the
 * target container. The wizard creates one file with the extension "xml". If a
 * sample multi-page editor (also available as a template) is registered for the
 * same extension, it will be able to open it.
 */

public class TrainingNewWizard extends Wizard implements INewWizard {
	private TrainingNewWizardPage page;
	private ISelection selection;

	/**
	 * Constructor for TrainingNewWizard.
	 */
	public TrainingNewWizard() {
		super();
		setNeedsProgressMonitor(true);
	}

	/**
	 * Adding the page to the wizard.
	 */

	public void addPages() {
		page = new TrainingNewWizardPage(selection);
		addPage(page);
	}

	/**
	 * This method is called when 'Finish' button is pressed in the wizard. We
	 * will create an operation and run it using wizard as execution context.
	 */
	public boolean performFinish() {
		final String containerName = page.getContainerName();
		final String fileName = page.getFileName();
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor)
					throws InvocationTargetException {
				try {
					doFinish(containerName, fileName, monitor);
				} catch (CoreException e) {
					throw new InvocationTargetException(e);
				} finally {
					monitor.done();
				}
			}
		};
		try {
			getContainer().run(true, false, op);
		} catch (InterruptedException e) {
			return false;
		} catch (InvocationTargetException e) {
			Throwable realException = e.getTargetException();
			LogManager.getLogger().logError(realException);
			return false;
		}
		return true;
	}

	/**
	 * The worker method. It will find the container, create the file if missing
	 * or just replace its contents, and open the editor on the newly created
	 * file.
	 */

	private void doFinish(String containerName, String fileName,
			IProgressMonitor monitor) throws CoreException {
		// create a sample file
		monitor.beginTask(Messages.TrainingNewWizard_0 + fileName, 2);
		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		IResource resource = root.findMember(new Path(containerName));
		if (!resource.exists() || !(resource instanceof IContainer)) {
			throwCoreException(Messages.TrainingNewWizard_1 + containerName
					+ Messages.TrainingNewWizard_2);
		}
		IContainer container = (IContainer) resource;
		final IFile file = container.getFile(new Path(fileName));
		try {
			InputStream stream = openContentStream();
			if (file.exists()) {
				file.setContents(stream, true, true, monitor);
			} else {
				file.create(stream, true, monitor);
				LogManager.getLogger().logInfo(
						Messages.TrainingNewWizard_3 + file + Messages.TrainingNewWizard_4);
			}
			stream.close();
		} catch (IOException e) {
			LogManager.getLogger().logError(e);
		}
		monitor.worked(1);
		monitor.setTaskName(Messages.TrainingNewWizard_5);
		getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				IWorkbenchPage page = PlatformUI.getWorkbench()
						.getActiveWorkbenchWindow().getActivePage();
				try {
					IDE.openEditor(page, file, true);
				} catch (PartInitException e) {
					LogManager.getLogger().logError(e);
				}
			}
		});
		monitor.worked(1);
	}

	/**
	 * We will initialize file contents with a sample model.
	 * 
	 * @throws IOException
	 */

	private InputStream openContentStream() throws IOException {
		ModelContainer model = new ModelContainer(Messages.TrainingNewWizard_6);
		Document dom = ModelProvider.buildDOM(model);

		ByteArrayOutputStream out = new ByteArrayOutputStream();
		XMLOutputter outputter = new XMLOutputter();

		outputter.setFormat(Format.getPrettyFormat());
		outputter.output(dom, out);

		return new ByteArrayInputStream(out.toByteArray());
	}

	private void throwCoreException(String message) throws CoreException {
		IStatus status = new Status(IStatus.ERROR,
				"com.eclipse.training.extensions", IStatus.OK, message, null); //$NON-NLS-1$
		throw new CoreException(status);
	}

	/**
	 * We will accept the selection in the workbench to see if we can initialize
	 * from it.
	 * 
	 * @see IWorkbenchWizard#init(IWorkbench, IStructuredSelection)
	 */
	public void init(IWorkbench workbench, IStructuredSelection selection) {
		this.selection = selection;
	}
}